If this is on the same side it can be due to wire break of the unit., or failure of power intot he unit.
it wil be ggood to take a test after removing the unit and check for power, if power is present , check the ground , then for drive of motor and motor.
Make sure the mechanism is not jammed and is free and the motor works with an external supply.
they are opposite sides of car..passenger side and driver rear?
Quite a coincidence but you must remove one side and check for the power first, if so it must work independently.
can't remove door panel... doors are locked.
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